Thumbnail
Access Restriction
Open

Author Li, J. ♦ Struzhkin, V. ♦ Mao, H. -k. ♦ Shu, J. ♦ Hemley, R. ♦ Fei, Y. ♦ Mysen, B. ♦ Dera, P. ♦ Parapenka, V. ♦ Shen, G.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword GEOSCIENCES ♦ EARTH MANTLE ♦ PEROVSKITES ♦ IRON ♦ SILICATE MINERALS ♦ HIGH SPIN STATES ♦ PHASE TRANSFORMATIONS ♦ PRESSURE RANGE GIGA PA ♦ ALUMINIUM SILICATES
Abstract The electronic spin state of iron in lower mantle perovskite is one of the fundamental parameters that governs the physics and chemistry of the most voluminous and massive shell in the Earth. We present experimental evidence for spin-pairing transition in aluminum-bearing silicate perovskite (Mg,Fe)(Si,Al)O{sub 3} under the lower mantle pressures. Our results demonstrate that as pressure increases, iron in perovskite transforms gradually from the initial high-spin state toward the final low-spin state. At 100 GPa, both aluminum-free and aluminum-bearing samples exhibit a mixed spin state. The residual magnetic moment in the aluminum-bearing perovskite is significantly higher than that in its aluminum-free counterpart. The observed spin evolution with pressure can be explained by the presence of multiple iron species and the occurrence of partial spin-paring transitions in the perovskite. Pressure-induced spin-pairing transitions in the perovskite would have important bearing on the magnetic, thermoelastic, and transport properties of the lower mantle, and on the distribution of iron in the Earth's interior. The lower mantle constitutes more than half of the Earth's interior by volume (1), and it is believed to consist predominantly (80-100%) of (Mg,Fe)(Si,Al)O{sub 3} perovskite (hereafter called perovskite), with up to 20% (Mg,Fe)O ferropericlase (2). The electronic spin state of iron has direct influence on the physical properties and chemical behavior of its host phase. Hence, knowledge on the spin state of iron is important for the interpretation of seismic observations, geochemical modeling, and geodynamic simulation of the Earth's deep interior (3, 4). Crystal field theory (4, 5) and band theory (6) predicted that a high-spin to low-spin transition would occur as a result of compression. To date, no experimental data exist on the spin sate of iron in Al-bearing perovskite. To detect possible spinpairing transition of iron in perovskite under the lower mantle conditions, we measured the x-ray emission spectra of an Al-bearing perovskite sample to 100 GPa. For comparison, a parallel measurement was also carried out on an Al-free perovskite sample.
ISSN 00278424
Educational Use Research
Learning Resource Type Article
Publisher Date 2010-11-16
Publisher Place United States
Volume Number 101
Issue Number 39
Organization Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)


Open content in new tab

   Open content in new tab